What is the facility cost of each spark plug?

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A tune-up automotive facility marks up its parts by 45% . Suppose the facility charges its customers $2.03 for each spark plug it sells. What is the facility cost of each spark plug?

Oct 28th, 2015

Thank you for the opportunity to help you with your question!

Let x be the facility cost of each spark plug because that is what we are solving for so it is the variable in the equation.

45%=45/100=.45 by definition of percent.

The facility cost is 100% x which is 100/100=1.

Multiply x by its cost of 1 plus the mark up of .45 and this will be the customer cost.

(1+.45)x=2.03

1.45x=2.03 Divide both sides by 1.45

x=$1.40 the facility cost

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 28th, 2015

Betsy, a recent retiree, requires 6,000 per year in extra income. She has 70,000 to invest and can invest in B-rated bonds paying 15% per year or in a certificate deposit (CD) paying 7% per year. How much money should be invested in each to realize exactly 6,000 in interest per year?

The amount of money invested at 15%=

The amount of money invested at 7%=

Oct 28th, 2015

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